Depending how you look at it this isn't entirely true for a few reasons, but also not entirely wrong either. I'll do "why its not true" first but also "why you're not wrong"...
The usage of this data is relatively unknown, but based on how autopilot is improved week to week it is assumed that it is being used to learn the speed to take turns, where lanes are, etc. The provider of Tesla's autopilot hardware (partially) calls this something like "Active Mapping". Or something.
The reason you're not wrong though is that Google has more sensor-rich data. Tesla vehicles currently just don't have the same level of sensor package onboard. So Google has a lot of data Tesla can't get.
Tesla's are actively collecting data all the time for autopilot-enabled cars, even if autopilot isn't purchased. Some basic info here: http://electrek.co/2016/04/11/google-self-driving-car-tesla-...
The usage of this data is relatively unknown, but based on how autopilot is improved week to week it is assumed that it is being used to learn the speed to take turns, where lanes are, etc. The provider of Tesla's autopilot hardware (partially) calls this something like "Active Mapping". Or something.
The reason you're not wrong though is that Google has more sensor-rich data. Tesla vehicles currently just don't have the same level of sensor package onboard. So Google has a lot of data Tesla can't get.